Lightfallen Sky

Suspend 10 - {2}{r}{w} (Rather than cast this card from your hand, you may pay {2}{r}{w} and exile it with ten time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost.)
Destroy all permanents. Each player loses life equal to the number of permanents destroyed this way.